Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987524)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(271045);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/21");

  script_cve_id("CVE-2022-49271");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987524)");

  script_set_attribute(attribute:"synopsis", value:
"The Unity Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the
UTSA-2025-987524 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    cifs: prevent bad output lengths in smb2_ioctl_query_info()

    When calling smb2_ioctl_query_info() with
    smb_query_info::flags=PASSTHRU_FSCTL and
    smb_query_info::output_buffer_length=0, the following would return
    0x10

            buffer = memdup_user(arg + sizeof(struct smb_query_info),
                                 qi.output_buffer_length);
            if (IS_ERR(buffer)) {
                    kfree(vars);
                    return PTR_ERR(buffer);
            }

    rather than a valid pointer thus making IS_ERR() check fail.  This
    would then cause a NULL ptr deference in @buffer when accessing it
    later in smb2_ioctl_query_ioctl().  While at it, prevent having a
    @buffer smaller than 8 bytes to correctly handle SMB2_SET_INFO
    FileEndOfFileInformation requests when
    smb_query_info::flags=PASSTHRU_SET_INFO.

    Here is a small C reproducer which triggers a NULL ptr in @buffer when
    passing an invalid smb_query_info::flags

            #include <stdio.h>
            #include <stdlib.h>
            #include <stdint.h>
            #include <unistd.h>
            #include <fcntl.h>
            #include <sys/ioctl.h>

            #define die(s) perror(s), exit(1)
            #define QUERY_INFO 0xc018cf07

            int main(int argc, char *argv[])
            {
                    int fd;

                    if (argc < 2)
                            exit(1);
                    fd = open(argv[1], O_RDONLY);
                    if (fd == -1)
                            die(open);
                    if (ioctl(fd, QUERY_INFO, (uint32_t[]) { 0, 0, 0, 4, 0, 0}) == -1)
                            die(ioctl);
                    close(fd);
                    return 0;
            }

            mount.cifs //srv/share /mnt -o ...
            gcc repro.c && ./a.out /mnt/f0

            [  114.138620] general protection fault, probably for non-canonical address 0xdffffc0000000000:
    0000 [#1] PREEMPT SMP KASAN NOPTI
            [  114.139310] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
            [  114.139775] CPU: 2 PID: 995 Comm: a.out Not tainted 5.17.0-rc8 #1
            [  114.140148] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
    rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014
            [  114.140818] RIP: 0010:smb2_ioctl_query_info+0x206/0x410 [cifs]
            [  114.141221] Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c8 01 00 00 48 b8 00 00 00
    00 00 fc ff df 4c 8b 7b 28 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9c 01 00 00 49 8b 3f e8 58 02 fb ff 48
    8b 14 24
            [  114.142348] RSP: 0018:ffffc90000b47b00 EFLAGS: 00010256
            [  114.142692] RAX: dffffc0000000000 RBX: ffff888115503200 RCX: ffffffffa020580d
            [  114.143119] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffa043a380
            [  114.143544] RBP: ffff888115503278 R08: 0000000000000001 R09: 0000000000000003
            [  114.143983] R10: fffffbfff4087470 R11: 0000000000000001 R12: ffff888115503288
            [  114.144424] R13: 00000000ffffffea R14: ffff888115503228 R15: 0000000000000000
            [  114.144852] FS:  00007f7aeabdf740(0000) GS:ffff888151600000(0000) knlGS:0000000000000000
            [  114.145338] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
            [  114.145692] CR2: 00007f7aeacfdf5e CR3: 000000012000e000 CR4: 0000000000350ee0
            [  114.146131] Call Trace:
            [  114.146291]  <TASK>
            [  114.146432]  ? smb2_query_reparse_tag+0x890/0x890 [cifs]
            [  114.146800]  ? cifs_mapchar+0x460/0x460 [cifs]
            [  114.147121]  ? rcu_read_lock_sched_held+0x3f/0x70
            [  114.147412]  ? cifs_strndup_to_utf16+0x15b/0x250 [cifs]
            [  114.147775]  ? dentry_path_raw+0xa6/0xf0
            [  114.148024]  ? cifs_convert_path_to_utf16+0x198/0x220 [cifs]
            [  114.148413]  ? smb2_check_message+0x1080/0x1080 [cifs]
            [  114.148766]  ? rcu_read_lock_sched_held+0x3f/0x70
            [  114.149065]  cifs_ioctl+0x1577/0x3320 [cifs]
            [  114.149371]  ? lock_downgrade+0x6f0/0x6f0
            [  114.149631]  ? cifs_readdir+0x2e60/0x2e60 [cifs]
            [  114.149956]  ? rcu_read_lock_sched_held+0x3f/0x70
            [  114.150250]  ? __rseq_handle_notify_resume+0x80b/0xbe0
            [  114.150562]  ? __up_read+0x192/0x710
            [  114.150791]  ? __ia32_sys_rseq+0xf0/0xf0
            [  114.151025]  ? __x64_sys_openat+0x11f/0x1d0
            [  114.151296]  __x64_sys_ioctl+0x127/0x190
            [  114.151549]  do_syscall_64+0x3b/0x90
            [  114.151768]  entry_SYSCALL_64_after_hwframe+0x44/0xae
            [  114.152079] RIP: 0033:0x7f7aead043df
            [  114.152306] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24
    ---truncated---

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://src.uniontech.com/#/security_advisory_detail?utsa_id=UTSA-2025-987524
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e840b3fd");
  # https://lore.kernel.org/linux-cve-announce/2025022630-CVE-2022-49271-55c9@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?60c9702e");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49271");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-49271");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/07/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/10/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Unity Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/UOS-Server/release", "Host/UOS-Server/rpm-list", "Host/cpu");

  exit(0);
}
include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'UOS Server' >!< os_product) audit(AUDIT_OS_NOT, 'UOS Server');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'UOS Server');
if (! preg(pattern:"^20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1070e', 'UOS Server ' + os_version);

if (!get_kb_item('Host/UOS-Server/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('aarch64' >!< cpu && 'amd64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-74.15', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.15', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.15', 'sp':'1070e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}


if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kernel');
}